Dennis Lindley is Emeritus Professor at University College London. Together with Bruno de Finetti, Jerzy Neyman, Leonard Savage, and a few others he is recognized as one of the most influential statisticians of his generation. In 2002, he was awarded the Guy medal in Gold by the (British) Royal Statistical Society for his major contributions to statistics, Bayesian methodology, and decision theory. Among the many papers he wrote, there are two that are of more immediate concern to us. The one that we publish here, and another one he wrote a few years ago on “The Analysis of experimental data: the appreciation of tea and wine.” The editors assume that the order in which the two beverages are listed in the title of the paper is due to the erratic behavior of the alphabet, and not to Professor Lindley’s preferences.